<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="addBtn">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in arr" :key="item.id">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click="delBtn(item.id)">删除</button>
            <button @click="changeBtn(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      arr: [
        { id: 1, name: "Tom", age: 19, sex: "男" },
        { id: 2, name: "Jone", age: 21, sex: "女" },
      ],
      name: "",
      age: "",
      sex: "",
      flag: -1,
    };
  },
  methods: {
    addBtn() {
      if (this.flag < 0) {
        if (this.name === "" || this.age === "" || this.sex === "")
          return alert("请输入内容");
        const obj = {
          id: this.arr.length ? this.arr.at(-1).id + 1 : 1,
          name: this.name,
          age: this.age,
          sex: this.sex,
        };
        this.arr.push(obj);
        this.name = "";
        this.age = "";
        this.sex = "";
      } else {
        this.arr[this.flag].name = this.name;
        this.arr[this.flag].age = this.age;
        this.arr[this.flag].sex = this.sex;
        this.name = "";
        this.age = "";
        this.sex = "";
        this.flag = -1;
      }
    },
    changeBtn(index) {
      this.flag = index;
      this.name = this.arr[index].name;
      this.age = this.arr[index].age;
      this.sex = this.arr[index].sex;
    },
    delBtn(id) {
      this.arr = this.arr.filter((item) => item.id !== id);
    },
  },
};
</script>
